in a minute

It seems like I spend the majority of my day saying "in a minute" while I run from one small task to the next. Truett needs help with his socks but I'm putting on my mascara. Jem wants some more milk but I'm feeding Caia her oatmeal. Jem's seat belt is stuck but I'm on the other side of the car buckling Truett in. The boys want me to play outside but I'm making our lunch. So I have to say, "in a minute" or "just hold on one second" and they get frustrated and demanding. They have figured out that "in a minute" can actually mean 15 minutes or half an hour.
I think I need a new phrase. Or I need my kids to notice that I'm not standing around doing nothing and that I'm doing my absolute best to meet their needs and keep up with their requests but there are three of them and only one of me so I'm a little outnumbered. But my kids can't see that yet or just don't care and I'm guessing that magical day when they do notice or care is a long, long way away.
I feel guilty that I can't run out and play every time they ask me to. I feel guilty that I can't sit down and read books whenever the idea comes into their heads. And I know that people say the housework can wait, that it will be there later. But dinner doesn't make itself and the baby can't put herself to bed and my boys still can't peel a banana without turning the entire top to a pile of mush unless I start the peeling process for them. So for now "in a minute" will just have to a part of our lives.