My ex husband had 2 obsessions, sex and money. He insisted on total control over any money coming into the household. This included the Family Allowance, he therefore kept the Family Allowance book that used to be issued. He was insistent that the money was only spent on things he approved of and not frittered away on clothes or other items for the children.
I left him 2 weeks after our youngest son, John, joined the Army at 16, at the time Family Allowance could be claimed after 16 for children in further education. My ex had applied for the benefit to be extended claiming the our youngest son had gone to college.
John was discharged from the Army after 6 weeks on medical grounds, something to do with his knees.
John then moved in with me.
The ex used the Family Allowance book to 'prove' John was still living with him and applied to the CSA for child support.
He still believes I owe him £3000 from this time.
This eats away at him, money that should be in his possession and isn't.