yichud

Question

hi rabbi, i live in the same town as my in-laws. I frequent their house and they frequent mine. I feel very comfortable with them. a)I s my relationship withm my mothr in law considered "libo gas ba"? b) i f yes then can i rely on the heter of "baalov bair" ( like the taz) or not? asc always thanks for your time and great work, martin