@strangerhoesagain
I wouldn’t get with a partner with children, not least because I married but because I have no desire to raise someone else’s cast offs.
What a vile, despicable, hurtful comment.
I can only assume you are the OP's mother.
My 2 daughters have boyfriends (one has been with hers 3 years, and one four years,) and I absolutely ADORE these 2 young men as if they were my own blood. I also care very much for their parents and they are nice people too. I think of these 2 young men as my own family (which they are, even though they are not getting married for several years.)
I also adore the children of my 2 BFF's as if they were my own (they have 3 each,) and I am like a auntie to them.
The OP's mother is very cold hearted, and unpleasant, and I can only assume that she has some unresolved issues from childhood, to have such a repugnant attitude.
I pity her, and I also pity the poster strangerhoes if she is being serious. It cannot be easy, being so full of so much hatred and rage. Ditto the poster @patronsaintoftruth who said about the OP 'just coz you're playing daddy, that doesn't make them yours.' Nasty. 
@beverlybothered, I echo what the posters say about going NC with your mother for a while. Her behaviour is horrible, and she needs to learn she cannot behave this way and get away with it.