I went through a period at work a few years ago, Ultra Darkness, when I seemed to become the Invisible Employee & my work went uncounted. I'm the only part-time worker & work night & weekend shifts. In spite of the fact that I've been there longer than anyone & have worked every position, the full time workers all have Seniority over me. One literally physically moved me aside to pre-empt my handling of a customer who had harassed me to break rules for her two previous nights that week.
I know it's different with family--but any time we're treated as if we're worthless, the pain is deep. Read in the Self Esteem Forum ... you might get some ideas. Check in some of the area and blog areas of PsychCentral too, and read up on feeling better about yourself--without having to come right out and ask people to say good things about you.
In the case of me at work, I checked job descriptions and found that no staff member in my shift was in charge of me--the Librarian was.
Please take best care of you--in all ways.
Roadie