Plough Driver: Once you have a stone house, you can pay 1 food at the start of each round to plough (at most) 1 field.
Groom: Once you have a stone house, you can build 1 stable at the beginning of each round at a cost of 1 wood. You do not need to place a family member on an action space to do this.
Manservant: When you build a stone house, place 3 food on each remaining round space. At the start of these rounds, you receive the food.
Pros: These cards become powerful once you have renovated to stone
Cons: Renovating to stone too early can limit the creation of additional rooms and thus family size. This will severly constrain your ability to score points/win.
Typical rennovation to stone typically happens late-game, (round 11-14) meaning you only get the cards' use two or three times.
It seems the only realistic way to use these cards is if you happen to draw at least two of them
and you also have either:
Clay Starter: When you play this card, if you only have 2 rooms in your wooden hut, immediately pay 1 food to renovate it to clay for free.
Conservator: You can renovate your wooden hut to a stone house without first needing to renovate it to a clay hut.
Question: Are there any other viable (competitive) use-cases for these cards?