Robin doesn't have a sister. It is his brother Brennen and his wife Dolly. The woman between Robin & Paula is his aunt. And yes, his parents are no longer together. They divorced when he was 7. They are both on their third marriages now.
On topic, that is an adorable baby. He looks very happy and seems to have parents and family that adore him, that's all that matters.
As for being uncomfortable around that many white folks. Paula's parents are divorced and she lived with her white mom so I'm pretty sure this is nothing new to her at all. Plus, she has been with or known this man since she was 15, that's nearly 20 yrs.
Besides, only racists are uncomfortable around other races. I hang with white folks just as easily as I can Hispanics, blacks, asians, etc. People are people.
And trust, when you are broke, you all the same.