Is it odd that my mother in law joined a Facebook pta for my daughter's preschool?

So my mother in law invited me to a pta group on Facebook for my daughter school. She is going to start preschool in the fall. I thought sure I'll join because it might have some useful information. I realized my mother in law was apart of the group as well. A little back story is that she was on a pta board when her kids were in school and for a little after they were done. So obviously kid education is important to her. I don't think of this as an official page for pta.

So my question is it odd that she joined the group?

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