[vin13ish]

Starting with Go-Busters, a trend where Red Ranger's Family member play important role

Hiromu's Parents were one of scientists who not only give their son a super power but become part of Enter and Escape's personality trait

Daigo's Father, Dantetsu "abandoned" his son because his ability of hearing The Earth's Melody and realize Deboss Legion will return and need Torin and Dr. Ulshade's help of forming Kyoryuger and want his son to be a Kyoryuger on his own

Right's Mother wasn't big important character like Dantetsu but does play a role where not only she was the only family member realize that Right is missing but because her imagination is stronger than civilian that it break the darkness in ToQ Train I think

Takaharu's Grandfather, Yoshitaka was center of the show's mystery as why his family think he was dead when he look healthy Turn out, He was already DEAD and he have use End Shuriken to resurrect himself

Now let me explain of why I think Yamato's parents will play important role

This will be similar to Magiranger

His mother fall in love with Bird Man who I think might be Yamato's REAL Father but Bird Man left her and the mother remarried another man so Yamato could have a father around

In Magiranger, Miyuki was a normal human when she fall in love with Isamu who is a Heavenly Saint who was forbidden to fall in love with a normal human but he didn't follow the rule

Giving Zyuohger is the 40th Anniversary of Super Sentai, I could see them making a reference of Old Sentai Show