Merging different VCF to discriminate samples.

Question

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Dear Biostars community.

I have 8 individuals from whom I run variant analysis (with GATK). So I have now 8 .vcf files.

These 8 individuals can be splitted into 2 groups and that's what I wanted to know.

Is there a way to merge the 8 .vcf files and to perform a kind of GWAS analysis to discriminate my samples ? Do you have any recommendation for a method ?

Thanks.