The groom hardly have any relatives

We had been looking for arrange marriage boys for my sister. My sister(27) is MSc BEd and a high school chemistry teacher in private college. The groom is a dentist in a hospital.

We found a rishta and my sister and the groom agreed so we just had engagement recently. It was a mid level ceremony at our end and close friends of family and extended family was invited. From groom side only 10-12 people came. We felt odd but didn't think much as it's arrange marriage and some people just do private roka. We asked them about people who will come for wedding from their side and list surprised us.

  • grooms elder brother probably won't visit. He live in Australia but hasn't visited them in 10 years. only his real bua in extended family is coming, she is a widow. And grooms grand mother and grandfather.
  • no mama or masi or grooms mom family is coming
  • grooms 2-3 friends and 4-5 people from office with their wives are coming.
  • grooms neighbor's - there are few in list from this
  • and some of the grooms fathers friends and family - (4 families in total)
  • grooms grandmother and grandfather also haven't invited a lot of people ( 3-4 families in all. )

Their list even if we try to stretch it is very small and hardly involves any of the relatives, even the grooms elder brother who is a iim graduate and worked at mnc in Australia isn't visiting. Their family belongs to this state and had been living in same city for 80-90 years.

Is there something we should be concerned about or it's just we are overthinking?