I've had the third degree for phoning my mother in law about an invoice for my BIL's funeral - apparently only dh should call about this.
Dh had opened it just as he was about to go out to watch ds in a play and so I phoned them.
I got asked why I had rung (as opposed to dh) and then in practically the same breath she asked if we would help pay the costs.
My joint account chequebook is obviously more a part of the family, than I am.