I am looking for ideas to help write a thesis statement for Alice Walker's Everyday Use. I'm not looking to focus on the heritage part of the story but more the relationships between Mama and her daughters.

A good way to begin organizing a paper on the relationship between Mama and her daughters is to annotate the story. Mark what Mama has to say about her daughters: how they carry themselves, what is important to them, how they treat her, how they treat each other, what they seem to want from their lives, and how Mama feels about all those descriptions.
A pattern should suggest itself once the annotation is complete. It seems, for instance, that Mama has always understood that Dee was a bit full of herself, but until Dee is so ungracious about helping herself to family heirlooms, Mama is willing to overlook Dee's arrogance. The quilts seem to be the breaking point. A thesis statement for this type of observation could look something like this:

Though Mama has a realistic perspective on both her daughters and is willing to accept them as they are, she draws a hard line when Dee's overreaching is hurtful to Maggie.

Use the annotation to organize the topic sentences that will drive the paragraphs in the essay.