No, there is only one "d" in the word "granddaughter."
grandaughter
Grandaughter
Your grandaughter would call your brother her great uncle.
manslaughter
Neptis.
No. It is a compound of grand+daughter and is spelled with both D's : granddaughter.
Enkelin
ljuba
"Cogratulations on your new grandaughter" in Polish is "Wszystkiego najlepszego z okazji narodzin wnuczki".
Ds stands for "double screen'' as in the two ds screens.
Εγγονή [eggonee]
Wren