My mother moved in with us in January (2019) and we are helping to take care of her. Her income consists of $12,450 in Social Security Benefits, a small pension of $3,600, and interest income of $455. That money goes toward her medical expenses since she has an aid come in to check on her. We pay the rest of her living expenses and she does not contribute to the household expenses. 

Can we claim her on our taxes?

If so, What effect would it have?