Reminded me of I Capture the Castle but not at the same level. Two sisters, worried about the family income and future. Not quite the same, though—no real romance, and Dad plays a very small part.
Told in first person by both girls, primarily the elder. At times difficult to figure out who is narrating, and the action isn't as smoothly described as it could be. Both are far advanced intellectually for their ages to the point that I couldn't quite believe in them.
Worth a read, though, and next book should be better.
(review of free book)