Travel / Time between flights in Frankfurt International Airport [3]

You should be good. I usually fly to Gdansk through Frankfurt. The International Airport in Frankfurt is very manageable. 50 minutes should be enough if your plane lands on time.

Remember also that you won't have to pick up your luggage in Frankfurt so it will save you some time. When there is a connecting flight you have to catch, stewardess will usually announce the gates to those flights before your plane lands. ( If they don't, you can always ask them. They usually get a print out from the airport)

If your plane is delayed and/or arrives later than scheduled and you miss your flight, it is not your fault and the airport should put you on the next available flight.

Genealogy / Niezabitowski, Kasprzyk, Wiatrowski, Researching genealogy of parents [8]

have you tried ancestry.com ?

my husband was trying to find out more about his family and was able to get useful information. ( you can see if the site works for you for 14 days for free)

Food / can I find curd and sour cream in Poland? [24]

Curd - in Polish -Twaróg or Zsiadłe mleko
Sour Cream - in Polish - Śmietana

You should be able to find these two ingredients in every regular grocery store.
Smaller grocery stores might not carry curd.

Real Estate / Flat prices in Gdansk Old town? [21]

here are two links to two apartments in Old Town that RE are trying to sell:

gdansk.nieruchomosci-online.pl/mieszkania,sprzedaz/1100658.html
gdansk.nieruchomosci-online.pl/mieszkania,sprzedaz/1090707.html

Real Estate / Flat prices in Gdansk Old town? [21]

I am not sure if you ( scottie 1113) read in Polish, but here is a link to an interesting website. It gives you a rough idea of average cost of sq meter of a flat in Gdansk.

oferty.net/ceny-mieszkan-Gdansk