See Rema Even HaEzer 21:5 regarding showing physical affection in front of others.
We’ve been over this before. It’s far from clear that this is a complete across-the-board prohibition.
1. It’s mentioned as a “yesh omrim” — hardly a unanimous opinion.
2. It’s mentioned parenthetically in an off-topic discussion.
3. The example given (combing through one’s hair) is an *extremely* intimate act — far more so than simply holding hands. It’s possible that the Rema is referring only to acts of that nature.
4. I don’t think the Rema meant it to include in the privacy of one’s own home in front of one’s children.
The Wolf