World Gone Mad

My grammar is far from perfect. My writing skills are weak. I hope to improve as I go through the First Language Lessons series with my children. But will someone tell me please - who started forming all these plurals with an apostrophe? I have seen signs that advertise "taco's." I have received gifts from "The Thompson's." This week, my husband's law practice was ordering a new sign. My husband walked in on the two secretaries arguing over "Attorney's at Law." He was horrified. He suddenly had a vision that the sign was in the front with the horrible grammar gaffe -- and no one noticed!!! I live in the South; I am all for regional eccentricities. But this is not regional or eccentric. It is just strange! Will my grandchildren learn this usage as part of Standard American Written English? Will I send them card's, present's and Animal Cracker's???