Yes, that tree is a fruit salad tree - a stonefruit graft, with an apricot, a nectarine, a peach, and a plum grafted to it. You're supposed to keep the grafts in balance, but I've let some of them run away somewhat, which has resulted in a very oddly shaped tree, and serious unbalancing.

The apricots fell off long before they were ripe, the nectarines got fruit fly (I didn't bag them), the peaches were small and we didn't get many of them, but the plums were pretty good (although not as sweet as I'd like).