Is it on a high shelf near a radiator (heat rises, remember?). May be too dry for it in that location. Did it live there last winter?

I’m no expert, but I’d clip off all the dead and move to a cooler, bright location. Don‘t overwater.

Hi I will move them somewhere else that’s a good idea and trim them? Is my current watering schedule too much then would you say?

Since we don't know what kind of media they are planted in, it's impossible to say much about watering practices. Except to say never let the media dry out completely (even the top layer) and do NOT stick to any kind of schedule.....water when the plants and the soil tell you.

Also, indoor heat is often too dry to make many ferns very happy so I would investigate ways to increase humidity around these plants.

Most ferns want to be cool, moist, in a humid environment and out of direct light. Follow those guidelines and you should do well.

where are you ... big city name ....

even with my forced air furnace ... which make the house very dry ... that usually doesnt happen until feb or so ... i cant believe humidity is the prime issue this time of year ...

most of us feel misting is useless ...

i suspect you are in GB ... since you threw forenight in the post ... if so.. i cant believe you lack humidity this time of year ...

all that said .. water when the plant needs water .. not on some random schedule ... whats his name can tell you about TELLS ... the short story is .... learn to insert finger .. AND FIND OUT ... or.. you can tell by the weight of the pot.. comparing when its sodden.. and when its dry ....

snip out all the brown material ... learn to water.. and give it a few months to recover.. we dont need to be fixing it every other week.. and perhaps creating more problems .. and since its winter .. almost anyway .. add a few more months of patience until it starts growing with vigor in spring ...

and.. like many of us... if you continue to struggle like most of us.. just find other plants that are easier to deal with ... ferns are NOT easy plants .. and dont drive yourself crazy trying to grow them ... replace them with something that brings you joy .. no matter how you treat it .....

ken

Judging by the radiator and the fortnight I’m guessing the OP is in the UK. There’s definitely a lack of humidity indoors, even here.

"There’s definitely a lack of humidity indoors, even here."

And here as well....even in a very humid-in-winter climate. Indoor heating of any kind will reduce indoor humidity from the moment it gets turned on in fall. It only decreases more as the season progresses.....unless you do something to offset that.

As long as the soil medium is fast draining, it is pretty hard to overwater a fern. They like it moist. Dryness, especially as it relates to humidity, is the primary culprit for indoor fern decline.

Thank you everyone! And thank you Ken for your message I appreciate it! I have found a windowsill upstairs where I will be moving them too that’s not direct sunlight and not near a radiator, that’s probably what has been killing then but it’s been the only spot up until now! I am from the UK I have bought some stones and trays for both plants to increase humidity!