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Laughing toxic parent ~My family was hijacked~

“My husband and son are being taken away by my mother!”
The family she had barely managed to build... was invaded by a toxic parent she thought she had cut ties with.
--Hikari's taciturn husband, her son with delayed speech... Hikari, the wife, is alone in her worries about her inability to balance work and household duties.
One day, Hikari is visited by Mitsuko, her toxic parent, who has been insulated from her.
She ends up acting like a newlywed couple with her husband, and her son even starts calling her grandmother "mama"... Will Hikari's family be taken over like this!?