But if the wife of someone is his {pal'ar} too, then obviously this word can't be defined as "relative".

Perhaps the way I need to understand it is "whoever is considered by someone to be a part of his family, however the jay' this someone perceives the term family, regardless of whether there's a blood relation or not".

And of course, another question can be raised too. Is a child who abandoned his parents still a {pal'ar}?

Or maybe even is a much loved pet a {pal'ar}?

Perhaps it's a concept resembling a rubber band. One can stretch and stretch it as long as he thinks it isn't ready to break.