Didn't you just post this a couple days ago? This site is for pregnant woman, mothers, and women wanting to become pregnant. Take your fake story somewhere else thanks. :)
Grats on becoming a uncle :-)
Hi.. seriously no offense but silly it's not possible.. sperms die outside the body infact within secs in dry conds.. second babies resenble either of the parent or are a comination of both of them and different traits might dominate so your sister's gene of colour dominated in the baby and he/she is fair.. so please put your mind to ease relax and be happy for your sister and her new born.. enjoy.. good luck..