Got together with exH when I was at school, married when I was in my teens. 25 years and 2 DCs later we split up, because he was an alcoholic, but stayed on what I thought were reasonably good terms - stayed friends, went out together, even went on holiday together - but on the understanding that we wouldn't ever get back together as a married couple. Both had dates with other people, but nothing serious - me because I didn't want to get involved in a serious relationship because I'd got hands full with DCs and work. Him, I now suspect, because he was harbouring a wish to get back together (I didn't know this at the time, he told me just before we divorced, because I mentioned I thought his new partner was a bit possessive).
Anyway, fast forward a few years, he's got sober, and moved abroad to live with another recovering alcoholic - as far as I know he's happy, and intending to get married when her divorce is made final. Hear from him intermittently (probably four or five times in the last couple of years) when he rings to speak to DCs (again, he's only spoken to them a couple of times - they don't really want to deal with him). I wish him well, but he's now somebody elses' problem and no longer a part of our lives.
Or so I thought. My sister has just told me that he's sent her and my other sis a picture of him and new partner wearing their matching Xmas t-shirts. Neither of DSis have seen him, or spoken to him, in years. Was clearly intended for them, posted to their addresses, not a misdirected e-mail. They're both a bit bemused, as am I.
Am not overly concerned, not likely to see him again, but is this a bit strange?