He, like his wife Dorothy, is deaf, and used this as an excuse to give up on his responsibilities as a father. As a result, he had difficulties putting his younger kids to bed, and communicating with them as well.
In addition, he also relied on Melissa to act as the hearing parent. Even when Jo got Kip and Melissa together to sort out their differences, Kip wrecked the moment by telling Melissa that everything would be fine if she would just go back to helping out the way she used to (which was obviously the source of many problems in the family). But, in the end, Kip apologized and promised that he will never treat Melissa like a 3rd parent ever again.
He was 44 at the time and is now 52 in 2016.
Kip's Facebook page - Shows his middle name is Alan.