My crab apple has become an apple....

My crab apple golden hornet has some apple branches.  I presume they are from the rootstock - does anyone know what tends to be used for crab apples? (Was planted by previous house owner so don't know any details.)

I don't mind whether the tree is an apple or crab apple, except that I want it to pollinate a recently purchased apple group (group 3).

What are people's thoughts on whether should let it do it's thing, or cut out the branches to keep it as a crab apple?

If I do remove the branches - which I'm tempted to in case the apples are another pollination group - I assume it's best to wait til spring?

I'm a bit confused here. Are these branches coming from a rootstock below a graft or above a graft? And is the graft low or is there a trunk with a graft at the top? Just trying to get a picture, I'm not a grafted tree expert.

Sounds interesting.

personally I would keep it as a crab and make some lovely crab apple jelly and they are useful for the strong amount of pectin needed in other jams and jelly's.

Well, here's my tree:

 If you look closely at the branches you can see apples as well as crabapples:

 Looking at the base, there are several trunks, one of which is apple (think it's the big one in the middle with the thin branch "cross" in front of it and plant label just to its left.

That's a hard one. I think I'd be pruning for shape rather either of the apples.

Weird thing is that the label that's still on it is for crab apple, rather than any sort of family tree.

Yes, nutcutlet, my whole garden needs a lot of work

Don't they always. I enjoy the winter prunings and shapings though.