history of the word mission
mission(n.) 1590s, "a sending abroad" (as an agent)
…
General sense of "that for which one is sent or commissioned" is from 1670s; meaning "that for which a person or thing is destined" (as in man on a mission, one's mission in life) is by 1805.
Meaning "dispatch of an aircraft on a military operation" (by 1929, American English)
was extended to spacecraft flights (1962), hence, mission control "team on the ground responsible for directing a spacecraft and its crew" (1964).
Good parents take care of their children, and provide a safe home to live in; however the children do not have an ultimate say. A good parent would have a discussion to explain the situation and also be sure the person moving in is safe to have around the children they’re responsible for, but ultimately the grownups pay the bills, put clothes on the children’s backs, and put food on the table. If the child feels entitled to an equal share vote in the household decisions then expectations should be managed.