My mother lives in So Cal and therefore can get discounts on tickets at times. If she were to buy tickets and take my 4 year old...what would she have to show? Is her photo ID enough for both of them?
Yes. I had friends come in from Utah and the CM let me buy their tickets for them so they could get the 2fer. I think it's up to six tickets per valid ID. But you might want to check for sure with Disney.