My grandson has a very highly refined sense of what's fair; particularly when it comes to going first. Note that I said "highly refined" and not "correct"; he is always convinced that his sister was first last time. Being as he is four, his conviction can express itself with some enthusiasm. Being as he is four, there is a good chance he can grow out of that enthusiasm, of course. I saw a wonderful question (and answer, Baruch HaShem) in זבח משפחה by R' C.T. Hollander, שליט''א. The background is that Moshe Rabeinu had come back from his conference with the Holy One, Blessed Be He/Creator and Author of Reality with (among other things) instructions on building the משכן/Tabernacle. The man chosen to manage every detail of the construction was בְּצַלְאֵל. Moshe Rabeinu carefully the work to be done, including the order of construction; vessels first and finishing with the משכן itself. After receiving these instructions from the highest proph...
This is a paraphrase of the pasuk in t'hillim 84:7 -- "mei'chayil el chayil" -- which means "from strength to strength". In this case, it is my thoughts and ideas to those who are strong enough to be interested :)