Is it alright to develop a good relationship to the child of your partner to another woman? How would this affect our own children?

for me po ok lang na maging close kayu or ituring mo na din na anak yung bata..kc bata sila di nila alam kung anu ang kasalanan ng magulang atleast pag nakakaintindi na sila di nila mararamdaman na ay anak pla ako sa pagkakasala like dat.ang mararamdaman nila eh u treat them like family.