After reading the page: "Is this English Correct", which I found to be very informative and interesting, I have a question regarding some examples given:
"Tom's family are farmers" and "Tom's family is wealthy."
First of all - what a great example of the ambiguities of this particular grammatical issue! And, I agree that both of the sentences sound correct to my native american ear.
Given that "la famille" is singular in French, I would assume that the adjectives would also be singular.
"La famille de Tom est agriculteur." and;
"La famille de Tom est riche."
Both of these phrases sound right to my ear.
I suggest that adding a few examples such as these to the lesson might be helpful. It would underline how the adjectives are singular in French with the singular noun, even when we might use the plural in English. ("Tom's family are farmers.")
Merci !