I understand the concept... And that is contrary to human nature to even attempt this.
Humans generally feel strongest about themselves and their children, then other immediate family, then friends, neighbors and everyone else. Remember, if you really tried to follow the spirit of this, if your children are yesterday and some starving kids in Africa didn't, you should send your children's food for today to those kids in Africa. If you want to follow the letter of this only, then you should be spending as much time with the crazy cat lady on your block than your grandma who lives in the next town over.
No one does either of these things and we'd think they were douchebags if they did.
This is just another nonsense commandment that you can't fulfill in any practical way as a source of guilt the church can sell you salvation from.