So, what about Arremonidae?
Arremoninae was introduced by Lafresnaye in 1841: Lafresnaye F de. 1841. Arrémoninées. Arremoninae (Arrémon, un des g. de ce groupe). Ois. P. 153 in: d'Orbigny C [ed]. 1842. Dictionnaire universel d'histoire naturelle. Tome second. Paris.; p. 153;
https://books.google.com/books?id=i65TAAAAcAAJ&pg=PA153 . (For dating, see: Evenhuis NL. 1990. Dating of the livraisons and volumes of d’Orbigny’s Dictionnaire universel d’histoire naturelle. Bishop Mus. Occ. Pap., 30: 219-225.;
http://hbs.bishopmuseum.org/pubs-online/pdf/op30p219.pdf .)
Passerellinae was introduced by Cabanis in 1851: Cabanis J. 1850-51. Museum heineanum. Verzeichniss der ornithologischen Sammlung des Oberamtmann Ferdinand Heine, auf Gut St. Burchard vor Halberstadt. I. Theil, die Singvögel enthaltend. R Frantz, Halberstadt.; p. 131;
https://www.biodiversitylibrary.org/page/49584510 .
Passerellinae is therefore unquestionably junior to Arremoninae. (Unless, with Bock 1994, you attribute the latter to Sundevall 1872...)
Arremoninae was used a couple of times after 1899. E.g.: Bade E. 1904. Die mittelleuropäichen Vögel: Ihre Naturgeschichte, Lebensweise und ihre Jagd. I. Band. H Walther, Berlin.; p. 158;
https://books.google.com/books?id=ztQpAQAAIAAJ . As a consequence, a reversal of precedence in its disfavour (= making it a
nomen oblitum relative to any other name) is not possible.
The last use of Passerellinae as a valid name before its recent revival that I am aware of, was in 1899 (in this:
https://books.google.com/books?id=BcQ-AAAAYAAJ&q=passerellinae ). Since Passerellidae/nae was not used as valid during the 20th C, and revived in 2013 by Barker et al, it has not been in use for a period encompassing 10 years during the last 50 years. As a consequence, a reversal of precedence in its favour (= making it a
nomen protectum relative to any other name) is not currently possible either.
An actual reversal of the precedence of these two names would of course require both.
In the 19th C literature, so far as I am aware, these two name were used for non-overlapping groups. There is no established tradition of using Arremoninae for a taxon within Passerellidae.
...What say you ?