Totally agree with Pheno.
You control which hints or people to add/ignore with Ancestry - not done automatically. Yes some users just add any old "rubbish" to their trees and it can be very annoying but again its down to you to sort out what is correct for your own tree.

To get back on topic I have added some "in laws" if I think there is some relevance in having them there. It can sometimes be helpful with your research. I had one "brick wall" where I couldn't find a "rellie" in the census before he got married eventually found him living with his future in laws as a lodger although his future wife was not there as she had gone into service.

Dorrie