BUR #5820 has been approved by @evazion.
create alias holding_hand -> hand_grab
Apparently the holding hand tag is for pics where "only one character is actively holding the other's hand". That means "holding hand" is terrible as a name, as it could also mean holding hands but just with one hand (and that's how it's mostly being used by looking at the first few pages).
Incidentally we also have hand grab just for that.
There's some overlap between these tags and wrist grab but I think it makes sense to keep them separate.
This alias will have to be removed after it's approved.