Both MLs are deaf and FL learn how communicate with them via sign language. Hoshi Furu Yoru ni is lighter and focused on side characters more than Silent, but both of them are feel good romance drama with no toxicity from the leads.

Both of them has morally gray lawyer as the main character, but you still root for them. The cast for both of them are amazing and very good.

Both drama has Ueno Juri and Tanaka Kei in it.
They both focus on the main leads with no intention to marry.
Female lead is living one of her parent and the story focuses on how they living with their parents.
Both focuses on the family aspect and marriage ideology.
Jizoku Kanona Koi Desuka focuses more on romance, but Kazoku no Katachi focuses more on family.

Both story is about male/female cohabitation. The overall vibe is slice of life and feels comfortable food with love triangle, but not too dramatic.

Both dramas are about the daughter and mother relationship and both of them are single mothers.
They also have a bit of romantic interest for both daughter and mom pair

Both of them has a dark side of police force.
Each episode add clues for main plot.