How to find the parents of my great great grand parents?

[Mike Turner]

johan nilsson born in oja parish 6/12/1849(d 10/16/1923.he married sara kristina johannesdotter born in moheda on 10/13/1853(d9/4/1915).they lived in Hjortsberga,Kronoberg County,smalend.they had ten children;anders,hilda,amanda,karl,ernst,ingrid,ida,ernst.(

[Bo Johansson]

Probably these two births from the KGF database of births in Kronoberg county:
 
Parish: Öja
Birth date: 1849-06-13
Bapt. date: 1849-06-14
Child's name: JOHAN
Child's sex: M
Father's title: BR. (brukare = tenant farmer)
Father's first name: NILS P.
Father's surname: NILSSON
Father's age:  
Mother's title:  
Mother's first name: MARTHA  
Mother's surname: PETERSDOTTER
Mother's age:
Placename: USTERYD  
 
 
Parish: Moheda
Birth date: 1853-10-13
Bapt. date: 1853-10-16
Child's name: SARA CHRISTINA
Child's sex: K
Father's title:  
Father's first name: JOHANNES
Father's surname: JONASSON
Father's age:  
Mother's title: H. (hustru = wife)
Mother's first name: INGRID MARIA
Mother's surname: JONASDR.
Mother's age: 29 ÅR
Placename: HORDA GYDINGSGD.
 
// Bo Johansson

[Mike Turner]

thanks bo

[Olle Andersson]

Mike!
Here some Genline GID numbers as reference if you want to go back from Gustaf:
864.21.72000,  
864.21.71900,  
864.20.53000,
864.10.35300,  
864.9.9600, Here Martha's first husband Sven Petersson dies.
 
Regards