i think you should add punctuation at the ends of all the lines in the first 2 stanzas, because you do in the rest.
and i think
"Our mom unpacked the china
as our dad shopped for an air conditioner."
would sound better. actually, i think the whole first stanza could do with some improvement; it's not as strong as the rest of the poem.
also, it's "y'all", not "ya'll", haha.
i would love to see some more expansion in this piece (though i understand you've already revised it, so i don't demand it). more imagery, descriptions of what texas is like, contrasts between minnesota and houston. i know you might not want to make the poem that long, but a few adjectives and adverbs added in would help to illustrate what you were feeling, what the place was like, or what the kids were like. for instance:
My brother and I tentatively swung
From our new chinaberry tree
To a curious audience
Of dusty neighborhood kids below.
you obvs don't have to accept my changes, but a few words can go a long way, as i'm sure you know.
i really like the last two lines. they make for a perfect ending. i also enjoyed the casual style; it fits really well.
hmm, i've never liked or used the word "y'all", though i've lived in the south. it's interesting to note the linguistic differences in a common language between the states, even though it's within the same country. i say soda, myself. well, good write, i liked it. and i'm not just saying that to "be nice".