People we are angry with, control us. Forgive this woman who for reasons in her past dysfunctional experiences is this way. We are all the sum of all of our parts over all of the years and all of the fears and tears. Forgive and release her and you will be content. "This is my commandment: that you love one another that YOUR JOY may be full" comes to mind here.Realize that like all men(except when they are in diapers) you cannot change this person! But you can love her and accept her at this stage of her life.It is so petty and life is so short. If you let go of all of this negative emotions and upset, you will in all likelihood, outlive her.She is needy and lonely. This baby is probably one of the only people in her life that make her feel good (about herself or life in general). Lonliness causes older people to become demanding, moody and needy. Someone needs to let her know It is NOT all about her, but that is not your job. She wouldn't get it anyway.She's wrapped up in her own emotional pain. Is she a widow to boot? Kids gone. Empty nest syndrome? She has probably had her hopes, dreams and wishes for unconditonal love hung on these children before you had them! Just an opinion. Ignore her demandings and smile , kiss her on the head when leaving , or rub her hand while you tell her you will be back soon or she will see the children again soon. I have worked many years with the elderly and infirmed. Yes they can be very demanding or downright ornery. If she were as busy as you are, she would not have time to do this annoying to you complaining. I have found that the more love, patience, and understanding I have with the ornery ones, the sweeter they become and love you unconditionally too. You will reap a good harvest with this woman if you can see past your annoyance and feel her lonliness.Thats what is really making her behave this way.And Yes they do act childishly as they age.Indulge her.