If when holding hands, hers is in front and his is in the bak, that relationship is doomed.
Whoever's hand is on top (in the front), is the dominant partner
When parents hold their children's hands, almost always, the parent's hand will be on top.
When a man and woman hold hands, almost always, the man's will be on top.
Notice that the man's hand is on top (in the front), and the woman's hand is on the bottom (in the back)
This body language suggests the man is the dominan partner.