The game you’re probably thinking of is Granny on Roblox, or one of the many Roblox games inspired by it. Search results show the official Roblox game “Granny | Play on Roblox” and related “Granny” variants, which fits the “grandmother” clue best

Why this fits

  • Granny is a well-known Roblox horror escape game where you try to survive and escape a house.
  • There are also similar fan-made or themed versions like “Granny house horror in Roblox” and other granny-style games on Roblox.

About the “sheep grandmother” part

That exact phrase doesn’t clearly match a known Roblox game from the results, so it may be:

  • a misremembered name,
  • a character skin or avatar,
  • or a different Roblox game with a grandmother character that looks sheep-like or is jokingly called that by players.

If you want, I can help narrow it down by the game style, map, or what the grandmother looked like.