occasional at home care for Mom

My mom is bedridden with Emphysema and I keep her one day a week. My Dad hires someone for the other four workdays (he works full time and is 76.)

We are looking for someone to work occasionally when needed, on a weekend, an evening, an occasional day of the week etc. Someone caring is just as important to us as medical experience. My Mom needs her medicine given to her, meals prepared and occasional help to the potty (by the bed.) Any referrals would be MOST appreciated.