Suggestions on home health care agencies?

Hello,

My mother has Alzheimers and we are at the points where we are needing some part time home care. Not looking for 24/7 at this point. I'm thinking 3 or 4 days a week for an 8 hour shift to give my dad a break. Does anyone have experience/suggestions for services that serve the Houston area? Location is on the NW/Cypress area.