A lot of this feels like people looking into their neighbor's bowl to see if they are getting more than them. Love him or hate him Louis C.K. has a great quote here “The only time you look in your neighbor's bowl is to make sure that they have enough. You don't look in your neighbor's bowl to see if you have as much as them.” Times are tough, don't blame the parents for what they have to do, blame your management if…
There is a team of 4 people. 2 have families, 2 don't. The ones that don't picked up the slack for the ones that did. Work quality was equal, but output was greater for the singles. The team has 2 slots for promotion. Do you ignore the fact that the single people put in more work or do you factor it in in the promotion decision?
You can't measure the amount that the 2 "slackers" are influencing decisions by talking to the 2 putting in more hours at a keyboard. A side conversation nobody bothered to document with could save weeks worth of work. Sometimes the ones who put in more hours contributed less. You may not be able to measure that.
I'll come right out and say it: Fixed number of seats promotion budgets and performance reviews based on individual achievement are usually bullshit. The entire game is false. Unfortunately it's religion for many people.