Sibling-in-law

Just like other affines, or ``in-laws'', siblings-in-law are related by a type of kinship called affinity. Just like the children of one's siblings, the children of one's siblings-in-law are called simply nieces and nephews -- if necessary, specified whether ``by marriage'', as opposed to ``by blood'' or ``by adoption''.

Question: are my siblings in laws my in laws
Answer: yes