Brent Lang Executive Editor of Film and MediaDreamWorks Animation’s “The Boss Baby: Family Business” and Blumhouse and Universal’s “The Forever Purge” both netted $1.3 million each in Thursday previews.The two sequels, which appeal to vastly different segments of the moviegoing audience, will likely be overshadowed by the second weekend grosses of “F9,” which is expected to earn roughly $28 million over the July 4th holiday.