You might think you’re good at counting cliches, but you’ll want to bring along a pocket calculator if you want to keep track of them in “Mother’s Day.” This is the third entry in what’s become director Garry Marshall’s series of holiday-titled and themed movies, after “Valentine’s Day” in 2010, and “New Year’s Eve” in 2011. Those two were sprawling, sloppy affairs that had some laughs and some drama and far too many characters and stories, some of which eventually intertwined.

This new one is no different, and it kicks off with the “mother” of all cliches, a voiceover from an unidentified mother (an offscreen appearance by Penny Marshall) who says the name of the movie, then starts complaining, “What about the other 364 days of the year ...”

Then, let’s see, there’s divorced Sandy and Henry (Jennifer Aniston and Timothy Olyphant), who have two sons and are still pals, until Henry drops by to announce that he’s eloped with the much younger Tina (Shay Mitchell). And we’ve got the widower Bradley (Jason Sudeikis), who has two girls who are about to have their first Mother’s Day without mom. There’s the nice young couple Zack and Kristin (Jack Whitehall and Britt Robertson) who have been together for five years and have a baby, but aren’t married because Kristin has abandonment issues over the fact that she was put up for adoption and has never met her real mother. And we can’t forget the two adult sisters Jesse and Gabi (Kate Hudson and Sarah Chalke), who share issues over and keep secrets from their racist, homophobic parents — Jesse is married to an Indian man, and Gabi is married to Max, whose name is actually Maxine. What storyline and which characters am I forgetting? Right. The bestselling author, successful entrepreneur, and HSN host Miranda (Julia Roberts, in a really bad red wig), who has never had time in her busy life to have children ... or has she?

There’s also constant talk of a Mother’s Day parade that’s going to feature small, customized floats, going through this unnamed suburb where everyone pretends to be happy, but everyone is actually fraught with emotional turmoil. For the record, I’ve never heard of a Mother’s Day parade.

The film keeps clunkily jumping from person to person, couple to couple, story to story, never allowing any of the actors to satisfactorily develop their characters. There are hints of what’s going on in their heads, most notably in the Sudeikis character, who has never been able to let go of his wife’s death, and constantly watches old videos of her (a cameo by Jennifer Garner, a Marine who was apparently killed in combat). And Aniston gets to show some comic frustration when she reveals her inner thoughts about her ex’s new wife — right to her clueless face.

Yes, some of the film is funny, but most of it is sappy, ridden with those cliches, underwritten, and overacted. The script also tries to mix in serious relationship problems with heart-to-heart talks and scenes of physical slapstick, but can’t find the proper balance.

When this all finally starts ending, it shifts gears, then keeps on going. There’s still a karaoke rap session, a hospital emergency, another heart-to-heart chat, and the revelation of Kristin’s mystery mother to deal with. “Mother’s Day” is an overlong (two hours) movie that just keeps ending.

— Ed Symkus covers movies for More Content Now.

“Mother’s Day”
Written by Tom Hines, Lily Hollander, Amya Kochoff, Matthew Walker; directed by Garry Marshall
With Jennifer Aniston, Kate Hudson, Jason Sudeikis, Julia Roberts, Jack Whitehall, Britt Robertson
Rated PG-13