I don’t really think that Gold refused to help Emma because he wants custody himself. I think he refused because he wants her to go to August for help so he can convince her about the curse.
However, if there is a custody battle, it might somehow come out that Gold is related through DNA testing or some other means. Seems after the Katherine situation, anything is possible regarding DNA in Storybrooke, even if it was tampered with. Of course, that would open a whole new can of worms with Emma about Gold and his son. Thinking all this though, I don’t think Gold’s going to get Henry. Unless they are ballsy enough to really go there.
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Keeper of Rumplestiltskin's and Neal's spears and war paint and crystal ball.