Samtools for 1000 genomes trio

[aggp11]

Hello,

I am trying to use samtools/bcftools for the 1000 genomes trio data. In the samtools documentation it says that using -T and -s options in bcftools view works for this. However, in the example they have, there is a single aln.bam file. I have three (father,other, child) aln.bam files, so I am not sure if I need to merge these bam files or is there any other way of getting just a single bam file for this analysis.

Any help would be appreciated

Thanks,
Praful