The couple, married for 16 years now, is cautious about conducting themselves properly in front of their four kids, reported Female First.
"David and Victoria both need to be strong as a couple to raise the kids so they're happy and healthy. They're also very mindful that if they bicker, the children will too.
"So they encourage everyone to be thoughtful, kind, and look after each other - just like they do," a source said.
"They're best friends They've become so close over the years that neither one can imagine living their life without the other, and I think it's changed them both for the better."
"I think they've both realised they can only trust, rely and count on each other. And that's their biggest secret really - they can still make each other laugh after years of being together.