Caught my husband crying

I sing to our boys in a rocking chair they are 3 and 1 before bed every night. I've tried different songs but they always request the same song. Tonight the three year old belted the words and the one year old made his own lyrics while I sang to them. Tucked them in and saw my husband crying on the couch. He said it was the most beautiful thing he'd ever heard. That our kids have a whole routine go down so easily but their favorite time is right before they climb into their beds we sing a song.

I love my boys all of them.