The patch is outdated and does not work, but we can modify the relationships using
Universal Ren'Py Mod / URM.
1. Download and install the mod in the "game" folder.
2. Lauch the game and load your game.
3. in-game press alt+m keys and in the search look for these variables and edit those value:
Landlady = Mother
landlady = mother
landlady1 = mom
Landlord = Father
landlord = father
landlord1 = dad
tenantf = daughter
tenantm = son
tenants = children
Roommate = Sister
aliRoom = Sister
aliroom = sister
aliRoomie = Sis
aliroomie = sis
aliTen = Daughter
Roommatef = Sister
roommatef = sister
roomief = sis
Roommatem = Brother
roommatem = brother
roomiem = bro
Flatmates = Siblings
flatmates = siblings
flatmate = sibling
household = family
neighborf = sister
neighf = sis
neighborm = brother
neighm = bro
neighborau = aunt
neighborun = uncle
and that's all...