Wait...I'm right so grapefruit is not a 'pompelmoes' or it IS a 'pompelmoes'?

It is a pompelmoes!

Okido . I'll hop some of them in the cart...and make my mom eat them so I can collect the seeds :p

Pomelo is larger than a grapefruit, also drier & not as acidic. Pomelo does not come true from seed, grapefruit does. Pomelo is one of the parents of grapefruit.

Namegiving of pummelo/grapefruit in different languages is very confusing.

In Flemish (Dutch) pompelmoes = grapefruit (citrus x paradisi) and pummelo = pomelo (citrus maxima).

The odd thing is, in French (France) this is just the opposite (pummelo = pamplemousse and grapefruit = pomelo). And to make the confusion complete, I think in the french speaking part of Belgium it is opposite from France (pummelo = pomelo and grapefruit is pamplemousse)

Just got back from the supermarket. Opened a lime which off course was seedless. Next took a grapefruit and it contained things that look like weird seeds but they don't look like the seeds you normally pull out of oranges.
Are this actually grapefruit seeds?

Yes, they look like aborted seeds.

Does that mean they are useless?

Yes, those seeds won't germinate as they didn't mature.

I've had worse looking seeds than some of the ones shown in Sven_limoen pictures that have germinated. Planting seeds is so easy to do, and at no expense, I would go ahead and plant them, and see what happens. After planting wait for at least up to a month to insure if any germination is possible. The original Saint Dominic Sour Orange seeds that I received from Sister Mary Catherine were drastic looking, but thankfully one of them germinated. - Millet (267 BO-)

The original tree started to have problems so I cut the tree back, and rooted the cuttings. Three of the cuttings rooted, so now I have three Saint Dominic trees. Two about 1.5 feet tall, and one about a foot tall. (265 BO-)