We had a civil ceremony at the only place available, a nasty place called Munro in the municipality of Vicente Lopez.
We knew it was going to be a matter of 15 minutes, and due to internal family conflicts we decided not to invite anyone except my husband' sister and his boyfriend - we needed witnesses, after all, and they were "neutral" - i.e. nor from my MIL' side, nor from my FIL' side (they went through a nasty divorce and the family split badly).
We told everyone we were getting married as soon as we booked the date, and also that we didn't want anybody at the Registro Civil in Munro, since it was really a bureaucratic thing and we wanted to avoid people arguing over who was invited and who was not. But we have been together for 6 years and we lived together even before moving here, so it is not like we met yesterday.
Of course, when furnishing our Argentinian flat we got no help whatsoever from my FIL, while in Italy we were helped by my MIL and my mom. With "helped" I mean they passed along used things they didn't need, such as plates, flatwares, curtains, an old couch, and old mattress or offered to help with chores such as getting a new stuffing for the old couch, or taking us to nice place to shop for cookware and then paying the bill, etc.
It is just that his older son got married, and he is the first son he has to get married, he just came back to the country after spending 25 years abroad after his mother moved to Italy (after divorcing). Nobody is asking for money, but some kind of gesture of support would be appreciated.