create sequence test86_circ_brother_seq;
create table test86_circ_brother (
    brother_id int not null,
    brother_sibling int,
    constraint test86_pk_brother primary key (brother_id)
);

create sequence test86_circ_sister_seq;
create table test86_circ_sister (
    sister_id int not null,
    sister_sibling int,
    constraint test86_pk_sister primary key (sister_id)
);
