What to do?

Here's a tricky one.

You have two children.

One is an introvert, thoughtful, deep, more quiet and reserved.  She isn't going to ask or demand your attention but secretly still desires it. 

One is outgoing, social, enthusiastic, talkative, outwardly fun.  She needs to be the center of attention and will demand you pay attention to her.  She has a way of charming people into doing what she wants.  

It's easy to see how one of your children might seem more attractive to be around than the other, just on the outside. She's constantly happy and excited but that sweet first child needs love and one-on-one time too.  You have to look for opportunities to engage with the first child because she's too polite to request it.   

What if one of your relatives feeds into that second child and gives her much more attention than the other?  What if she chooses to sleep each night in bed with the second child but not with the first child? The first child very much wants this relative to sleep with her too but won't flat out ask for fear of rejection. What if she says "I want to go tubing with the second child" but never mentions wanting to tube with the first child?  What if when she comes to spend time at your house she chooses to go home once the second child has a commitment rather than spending time with the first child? 

And your first child is smarter than a whip and gets it, she sees it, she wonders why the relative doesn't seem to care as much about her.  It has to hurt.  What if you mention it to your relative but nothing seems to change?

What to do?  What to do?