While we are in a storyline where Rumple is in a quest to contain powerful magic in that hat, I fear for Henry and/or Baby Neal if they display signs of having the gift of magic.
I’m not sure Rumple would harm his own grandson. (Except for that one time when he tried to cut the cords on the swing set) but, whatever. I think he at least has enough respect for his own son, Neal, not to hurt his son.
However, baby Snowflake, is another matter. I think Rumple might be VERY interested in that baby.
I think we will see Snowflake’s magic sooner rather than later.