Not apple or pear but beyond that I'm not sure.

The flower looks like a wild rose. The fruit looks like rose hip, too.

Perhaps Quince.

Konrad,

I looked up quince, quince leaves looked similar to the leaves in this pic. Although several pictures showed quince flowers in clusters, a few pic look similar to this one, too.

Quince, the fruit that's only good as rootstock....lol

Definitely quince. If the original plant was cut out, the result would be a bunch of suckers. A clump of suckers can also form on a root node some distance from the original tree. My blossoms are just now showing colored tips.

If you make preserves having a fruiting Quince is by no means a negative.

I agree. Quince preserves or tarts made with the processed fruit is an excellent treat.

speedster1, it is a common perception that quince is nearly inedible, but actually there are several different varieties of quince. Fruiting quince (Cydonia oblonga) can be very tasty after being cooked. A few of the varieties can even be appealing to eat uncooked (especially when sliced thin, and sometimes served with chili vinegar mixed with crushed peanuts).

Flowering quince is closely related to fruiting quince but classified under a different genus, Chaenomeles, and is not very suitable for eating. However, in Latvia they were experimenting with making flavored processed foods from these little quince fruits, since the fruiting quince species has difficulty growing in that country's harsh cold climate.

Chaenomeles fruit make perfectly good jelly but they are smaller and prickly to pick. The OP has Cydonia oblonga so that's not a problem. One fruit sliced into an apple pie is excellent. And a single quince in the fruit bowl can perfume a room.

I can remember my mother making some type of pastry several year back with Quince. She had gotten some recipe from watching the food network. I remember it being quite bad and telling her how much better it would've been if she had used apples. lol So admittedly that is my only experience with quince. To reiterate my point though it seems it's a fruit that most don't bother with unless they are using it for rootstock to grow pears.

It's a pity your mother's efforts didn't work out because you've missed a great tasting fruit that is very important in many parts of the world, not just as a root stock. Google up the origin of the word Marmalade to see how long it has been prized.