It depends on what kind of parent you are and how determined you are to make it work. Once mature, a macaw probably will not be a pet where everyone piles onto the couch with a bowl of popcorn and watches cartoons on Saturday mornings and everyone gets along and its all one big happy family and everything is wonderful all day long for ever after. If you are the kind of parents that says something like "If an animal bites my child, it can't live in my home", then probably a large parrot and most small ones will not work for long. All baby macaws are wonderful. You might have mass snuggle fests with a 3-6 month old baby. But sometime around 6-14 months the little darling will start picking favorites and testing everyone especially the less favored. For less favored people, it might require some special handling and training to maintain a civil relationship. Young kids might have a hard time with that and have feelings hurt, jealousy etc depending on the dynamics of your family.
Yes, they can seriously injure a finger. You teach your kids not to poke. Some parents have that kind of control and respect from their children. Some just don't. Its not a criticism, its just fact. I had a family come over several years ago wanting to buy one of my quakers. The kids were screaming and running all over the place and the little girl kept jamming her finger in the bird's face. The bird didn't like that and lunged. The kid apparently modeled behavior it had seen its parents do and shouted No and jammed her finger in its face some more. I swatted her finger out of the way a few times not wanting a confrontation with mom and dad but the kid kept doing it. So finally I decided fine, don't listen to me and feel the consequences. Yup, she got a little pinch, she did some screaming drama but didn't do it again. Bigger beak can mean more damage.
If your kids are literally too young to understand, then a plexiglass barrier or child gate or dog's X-pen put up around the cage will help. If your worried your kids are going to poke at it anyway even when they know not to, and you don't want your kids to learn the hard way, then don't get a macaw. However, it can be a great experience for them. They learn how to communicate with and respect a basically wild animal that is totally other than themselves. That is a great life long lesson to learn. It depends on people's attitudes within the home. Its the parent's job to train the kids and the kid's job to listen. You'll have to decide how well that works in your home before bringing a macaw into it.
Melissa