Two share bigger bedroom with a closet organizer for their things and toys elsewhere. One gets own room. Many kids share.

We were five with three sets of bunk beds and three rooms. Depending on ages we shared in an array of pairs. Very young children who are different genders share easily. Function first so put the needed furniture where it fits windows be damned. When my three were small we had all the beds (one bunk bed set and a crib) in one room and toys in the other for a time. Ages matter. Flexibility helps. Perhaps the arrangements will change over time. Your choice is bunk beds with room to play/move or "personal space".

Without more context? .............below options. You don't need "pictures" as none will be exactly what you have, or represent exactly the limitations within what you have.

Context........Genders, ages, Kids have.........JUNK.

I don't love your floor plan, : ( despite not seeing the entire floor

Is this a new to you home? A build? A remodel? Your buddy bath is nothing but inconvenient banging doors. ^%$#!!

Is there a reason for the 7 1/2 hallway width?

Show all the REST of this?

I'd fix that BATH mess if possible.............get rid of the door banging/cramping.

One step further? No wall ar sink end /toilet, Gain four inches, (I meant to eliminate.)

Learn to share, !

Where is the bathroom to be used by occupants of the larger bedroom?

^^

Primary is other side of hall. Bath ( see the sink ? ) then leads to small walk in closet for primary suite

13'7 x 16'5 is primary bedroom.

Pretty usual set up for an average family . Get a set of bunks and a twin bed set the bunks up in the space where thy can fit and done. Or like we did where the 3 kids had to share a room for awhile we did a set of bunks and those had a trundle . The kids liked it for whatever reason . We were living in married student housing for 3 yrs The J&J bath is the issue in your case .There is no need for nightstands in cramped quarters IMO

Are you doing a renovation or asking for layout help? Another thing that is possibly and may give you more space is to take the doors off the closet, put a dresser in the closet ajd then you lay have enough space for a twin to go on the wall where the bathroom door is without closet doors in way. It is right for sure in the shared room but of the room becomes just for sleep it won’t matter. Do you ive spade elsewhere for toys and what not? How old are the children? As they age is there more room to spread out down the road?

And don't be afraid to experiment with layouts. Because you placed furniture one way today, doesn't mean you can't move stuff around in a few months. It took me two years to come up with the furniture arrangement for a guest bedroom. Every time my parents came the furniture was in a different spot!

Bunk bed for the larger room and a twin for the smaller room is your best option.

I know kids love bunk beds, but they are a pain to change bedding. If you can possibly keep regular twin beds that would be a great help.

^^^

As Cage..

^^

Can be separated any time.......and big NO to any that are larger.Yes, must go in front of the window., or be too close to entry, and look IN your face: ) as a wall.

In a pinch, three can fit and you get a guest in the lone twin room

You have no space for dressers so all storage in the closets for sure .

And/or have under bed drawers for storage as in pic above.

Sounds like your objection to bunk beds is that you want each child to have their own space. If so, consider a raised bed with desk, storage and seating underneath.

The hallway is wasted space. Incorporate it into the smaller bedroom with a larger closet. The head of the bed can go where there was previously a closet.

I would do an Lshape

Then make sure the beds have drawers underneath

You did not specify is this is just a furniture problem or if other roads can be taken.

Expanding the room looks fairly seamless. I don't see a problem with the J&J bathroom.

I suspect the only way you can get two beds in one of those rooms without bunk beds is to use the closet. In the bigger bedroom, you could put one bed along the right wall, between the bathroom door and the closet. The head or foot of the bed might be in the closet. You could remove the closet doors. You could then put a wardrobe in the corner between the window and the bathroom door. If you had one of those slightly raised bed with drawers underneath, you might have enough clothes storage.

You'd need to do some careful measuring to make sure everything would fit.

The issue in this house? Storage of every variety. Just one reason I asked above as to hallway width.

Where are all the towels, toilet paper, bedding being stored. We aren't seeing the entire floor plan. We don't know age /gender of the the three kids. Just as we don't know if a build, a new to them, a remodel or much else,

The buddy bath? No way would I want all the doors, which just eat inches. and hem in that space.

Basically this without the book case, as will be too close to bath door entry, Tune either way, depending

Just know you can get more floor space initially, with a bunk, still have drawers and separate later.

Now. AND later, just use twin OVER twin,

There's no right, , no wrong and may depend what furniture you already own. May depend gender, and a lot else, including ages

Interesting you feel that bunk beds don't give kids their own sense of personal space. I know lots of kids with bunk beds know who feel differently. The top bed is so personal because you are on an entirely different level, a private perch. Kids on the bottom have either own little cave. I don't think their minds read furniture in the same way ours do.

Plus, you can make all kinds of curtains, little wall storage shelves, and wall hung sconces for each level.

I also suggest you install a pocket door for the bedroom I show with the two twin beds.

If you are really averse to bunk beds, you might consider a trundle.

It would entail opening and closing each day/night, but is a space saver.