Sorry tiktok , haven't had time to reply to your post about what a doula does, but Pupuce has done it very well., better than I could and I trained to be one!!
Seriously, they will do anything you ask them to (within reason!) to make life more comfortable and restful and less stressful at the time of having a new baby around, and yes, they help out with older kids, housework, the huge basket of ironing, do your weekly shop, whatever YOU need to make you feel good!
Charges are about £10-£15 an hour, minimum of £4 hours, but that can be down to the individual doula, if you wanted less hours per day.
Some doulas also work as ante natal doulas, and help you through the birth process if that's what you want. It appears that less and less male parters/DH's are wanted in the labour room, (Michel Odent also says they inhibit the labour process) and more women want a female birth partner. HTH!