My mil was Nani to my children ( Sicilian), and I became Nani to my dgds, DH was grumpa.....story is, he was crabby one day when youngest grand was over and I laughingly called him grumpa that day and it stuck! Now there are 3 gg and I am Nani to all.........sadly grumpa is no longer with us.........and I guess Nani will no longer be after I am gone too.........