"Don't pay kids to do their chores. (it's alright to pay them to do your chores!)"
Everyone in the family has chores to do. It's part of being a valuable and valued member of the family. We share in all that it takes to make a house a home and have everything run smoothly. Chores are something we all do.
Where does an allowance come in? An allowance is given becasue family members need things (clothes, birthday part gifts, lunch money, shoes, books, an occasional treat) and its great to give them control over how they spend their money. You get an allowance becasue everyone in the family gets one. If you spend it badly... oh well! A love and logic parent will gibe lots of empathy or lead into problem solving with a question like, "What are you goin to do abiout that?" (Rescue is not recommended.)
So what if they don't do their chores? This is where an allowance becomes a might tool. When you are giving the weekly allowance you can deduct from it the amount you used to pay their sibling or someone else to do the chore they negelected. (Comedian and author Dr. Kevin Leman once charged his son $10 for taking out the garbage on a day the son had forgotten to do so. When the son objected Dr. Lehman explained, "Hey you just paid a PhD to take out the trash!"
What if they need extra money? "Don't pay kids to do their chores. It's alright to pay them to do your chores!" You may offer to let them do some of your chores for a reasonble price determined by you. This should be based on how much time it takes to do the chore, your going rate for child labor, etc. Afterall, if they don't like your pay scale, they can always check with neighbors and see if they need chores done.