Joshua Rush has joined the cast of Fox and Walden Media co-production “Us and Them” starring Billy Crystal and Bette Midler. Pic also stars Marisa Tomei and Bailee Madison with Andy Fickman directing.

“Us and Them” stars Crystal and Midler as grandparents who struggle to cope with their grandkids’ modern ways. Rush will play one of the grandkids.

Crystal, Peter Chernin and Dylan Clark will produce through Chernin Entertainment. Lowell Ganz and Babaloo Mandel penned the current draft, with Lisa Addario and Joe Syracuse writing the first.

Past credits for Rush, who is repped by the Osbrink Agency and Curtis Talent Management., include “Saving Lincoln” and “Megamind.”