DD#1 has a different Father & so she has my surname, she uses DH's surname at school & on almost everything, the only things she uses my surname on still are legal doc's Medicare card & her passport, everything else she is our married surname!!!!

DD#2 is Dh's (our) married surname!!!

So bubs can still have Mum's surname legally like on Birth cert, passports, medicare etc, but be enrolled at school, kinder etc, etc as DP's surname?!