How many dishes you will expect a host have for their guests if she invite people at their house?

Like for a get together? In this case the get together is only among relatives (not really strangers at all). Lets say a birthday in the case the host only invites 4 people.

Should the host have plenty of food to share or few?

My sister (who is married) invited my mom, me and my brotehr to her house to grab some coffee in order to celebrate her belated birthday. My sister for the COVID pandemic she and her husbadn no longer like a lot of people at her house, not even if there are relatives or family. I mean she got used to not having or get close to many people, and now that even that is possible, she does not like to invite many people at her house anymore, she and her husband got sensitive and now they get bored in buying a lot of food for people now like pre pandemic.

The reason she only invited us and not her super close cousins or relatives. My sister and her husband are in a Cetogenic diet but my mom my brotehr and I are not in taht dumb diet or dieting at all. So also because of that she does not invite a lot of poeple cause other people are not in any diet like them. Anyway since only mom my bro and I are going to celebrate her bday, she told us: For the sweet dish Im just going to have the cake and icecream that is all and for the savory part just some chicken turnoever. Nothing more than that. Then I was thinking to myself? Really just taht? Only beacuse they are not eating a lot does nto mean she had to be that cheap not to buy something more. Well, she told me that is all she is going to have for everyone to eat. Of course mom said to me, Lets buy just one more savorty dish.
How many dishes you will expect a host have for their guests if she invite people at their house?
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