Extracting germline variants from somatic variants

Question

[Nelislam4]

Hi,

I have two somatic variants vcf files SNVs and Indels for cancer and normal tissue had variant caller of VarscanSomatic, Strelka, Pindel, GatkSomaticIndel, and Sniper.

How could I know that these files have germline variants? and If it has, How can I extract the germline variants from somatic one?

Please Help