I imagine the Cruz family is close like that.Caroline and Catherine are natural and comfortable in Cruz Christmas Classics because Ted loves to read to them in real life. Heidi has mentioned before that he is very animated as he reads to them to make it extra fun for the girls.
The video link below is cued to a segment where Heidi describes the bond between Ted and his precious daughters.
The Story of Ted Cruz (produced by Make DC Listen PAC)
If you want smart kids, read to them when they’re little.