Tsuma, Shougakusei ni Naru.

Somebody special to the main character has passed away, but miraculously they are given a second chance. The person comes back to life, and this time, they do everything they can to cherish and protect their loved ones. The settings differ, as Tsuma is family-themed while Orange focuses on school life, but both are emotional and have a dark twist.  

Both anime focus on a loving father and his caring family, showing how far they will go for each other. Although the plots are different, they both share a strong theme of family. At first, the stories seem wholesome and happy, but they also have a dark twist that makes it hard for the characters to live the lives they want. As they try to go back to how things used to be, they realize it’s much harder than they expected. They're both very refreshing, unique animes 

Both of these heartfelt stories are about a strong willed mother who has been given another chance a life that was cut short and become young again much to the surprise to their family members. (Though 'reincarnation' is the main driving force for TsumaSho, whereas 「Mom I'm Sorry ！」is more supernatural.) In a sense, both shows are about the appreciation of the time spent with the family and how letting go becomes the challenge for each family. They also share some similarities with topics and themes such has single parent challenges, second-hand happiness, domestic abuse and self-martyring/altruism. 

Both shows have a similar premise where someone in the family becomes younger. ('Reincarnation' being the main plot element for TsumaSho; whereas Jiisan Baasan has spiritual/supernatural elements). The common recurring theme in both shows is 'Second-hand Happiness'; where they proudly see their kin maturing becoming upstanding people as they face challenges in becoming an adult. And helping them face those challenges when needed.  

Despite some supernatural elements (mythology magic/ "reincarnation" respectively); both of these shows contain themes of filial-drama such as a death of a family member, single parenting issues, domestic abuse and second-hand happiness due to the altruistic nature of the main character. TsumaSho & Fruits Basket tells a tale of bonds of family and the struggles of relationships and letting go. 

Both shows are about the struggle to move on from the death of a loved one and to cheerish every single day you can share with the people you care.