Yes, I have a lot of experience of immigration offices in Samui, KPNG, Phuket, Phang Nga and BKK. Samui is by far the most lenient. KPNG is a subordinate of Suratthani not Samui and is also a new office therefore will follow the rules more closely.
If you're visiting your wife's family then does that mean that you are married to a Thai? If so then path of least resistance would be buy non o based on marriage visa that you can then extend for one year. This visa permits work if supported by a wp