What's the Name of That Book??? discussion

This topic is about
The Great Pony Hassle
SOLVED: Children's/YA
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SOLVED. Children's/Young reader book: 2 sets of twins from different parents get a pony. [s]
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The story was set in the south, I think. It was about a family navigating life as mom (who had one set of twins) and dad (who had another set of twins) moved in together after getting married. There was a pony out to pasture nearby and one or two of the kids were really invested in caring for it and cleaning him up, and eventually they end up getting the pony I think? They also mentioned chiggers, which weirdly enough is what reminded me of this book. I think it was set during the summer time and possibly covered fall, but I don't remember exactly.