I am not Dominican, but that is the reason why I never wanted to marry a man from my own country - we have the same thing - children
have to be close with parents
You can learn how to ignore it and not get irritated if you want to be with him... But you have to be nice to his Mom: ask her what he likes, how to cook for him, etc. It is important for her. She needs to trust that you will take care of her baby. Otherwise your relationship might be over soon. Definitely - do not agree to live with them! Sometimes such mommies feel that their boys should not be helping out their wives around the house, doing anything in the kitchen, etc. They get involved into everything - it is not good for a couple. Be very careful talking with him about her, she was there before he met you, she will always be his mom.