Grammar Continued

I come back to grammar because it's one of the things I always watch out for when I type my research papers. This morning, I noticed a student typing a sentence containing the word 'it's' before the word 'foundation.' I told him that word is a contraction and he should use the possessive form, 'its.' He thanked me for it. My family, on the other hand, should keep their cool when I point out errors. Whenever I correct them even with the subtlest hint, I get scolded. They would be fine with being corrected... if I was an ENGLISH TEACHER! Man, I feel like one of the few people in the nation who are always belittled for their skills.