How should I mention marriage to my boyfriend?

Hint at him! Don't be too abrupt. Marriage is a matter for two people. In fact, after reading your description, I feel that he also wants to marry you. Just some small family reasons. You can help him solve it together, so that he won't have a burden. If you don't mention it, he will also mention marriage. If you want to be husband and wife with him, you should always give in and help each other. Only in this way can you go for a long time ... bless you.