adult son living at home moving from esa to universal credit

hi my partner and I received our new universal credit claim after moving from esa

Our son is now migrating from esa to uc will it affect how much we get

We do get the housing cost element

I didn’t realise I had to say he was living with us as it didn’t affect our housing benefit claim

shall I inform uc

Thank you

This is all new to me and I don’t want to get it wrong

Thanks