Congrats Op, that’s a amazing news!
please ignore the doomsayers who are saying that 21 is too young to have a child - it’s not. They may not have much money but they can still be brilliant parents!
We were teen parents (18 &17) and it was a struggle, I won’t lie. But we were able to do all the fantastic things with the kids because we have all the energy to so. Kids don’t need everything bought for them or holidays, Nannie’s etc. they need time with their parents and that is what your grandchild will get.
We had no help from parents - after all, why should we have? We were adults making adult decisions.
Yes it may prevent your daughter from sorting a career out young, but she’ll have the opportunity at a later date should she want to. My DP stayed at home for 6 years until both were at school then went to uni. She has a great career now and was so happy she spent time with the kids.
As for them, they’re 28 and 27 now, did very well at school, college and uni, despite go to the local school that was the definitely the worst in the area (we didn’t have money to move into catchment area). Bit have very good jobs and have had their own homes for the last 4-5 years.
You can rent to your children and they can get benefits for it but would you just be able to rent it to them for the amount they would be expected to contribute before benefits? Also, if you have a mortgage on the flat, check the fine print as many exclude renting to mmediate family.