first, politician second. The evidences are pretty clear: his relationship with his kids and his political power seeking in late stage of his life after he finished his other life goals (money and family).
Biden is truly a political animal, staying in DC since his 20s for 50+ years and never getting tired of it (ok, there were 3 years of retirement before he ran for president). Biden even couldn't finish payoff of his mortgage at the age when he became Obama's VP. This is a very basic life goal that most ordinary people would accomplish at his age.