It's hard, i have been through it twice now while I'm meant to be on bed rest. Be honest with the eldest and explain you need to rest, ask them to help play with the 2 yo, let them climb up onto the couch to hug you don't lift them yourself. Turn on abc2 and let them watch it, a few days won't hurt and it may save your sanity. When they nap rest too, it's more important than anything else.