If The Members Took Roles in the Family :

Sunggyu:
Father → Himself
Mother → Dongwoo
Older Brother → Sungyeol
Younger Brother → Myungsoo
Pet → Sungjong
Sister’s Boyfriend → Hoya
Neighbour → Woohyun

Dongwoo:
Father → Himself
Mother → Sunjong
Older Brother → Sunggyu
Younger Brother → Myungsoo
Pet → Sungyeol
Sister’s Boyfriend → Woohyun
Neighbour → Hoya

Woohyun:

Father → Sunggyu
Mother → Dongwoo
Older Brother → Himself
Younger Brother → Sungyeol
Pet → Sungjong
Sister’s Boyfriend → Myungsoo
Neighbour → Hoya

Hoya:

Father → Sunggyu
Mother → Dongwoo
Older Brother → Woohyun
Younger Brother → Sungyeol
Pet → Sungjong
Sister’s Boyfriend → Myungsoo

Sungyeol:

Father → Dongwoo
Mother → Sunggyu
Older Brother → Hoya
Younger Brother → Myungsoo
Pet → Sungjong
Sister’s Boyfriend → Myungsoo
Neighbour → Woohyun

Myungsoo:

Father → Sunggyu
Mother → Dongwoo
Younger Brother → Sungjong
Pet → Sungyeol
Sister’s Boyfriend → Hoya
Neighbour → Woohyun

Sungjong:

Father → Sunggyu
Mother → Dongwoo
Older Brother → Hoya
Pet → Sungyeol
Neighbour → Myungsoo