To be sincere, the best companion you will have is your husband or your wife. He or she will be the one to take good care of you and the children and take make sure that the home is lacking anything.
So, vice versa, make the best companion in which ever way.
While I may agree with you that the best companion could often be your spouse, I may differ with you on your expectations from your companion.
To expect a companion to look after you or your children is not fair. while I am all for doing this together because you are a family, a team.
A companion is one you completes you and brings out the best in you and you do likewise.
You work together as a team.
That is how I see this relationship.