In notes:

rirspe
x1 is the step-parent/step-mother/step-father of x2 due to marriage with their parent according to law/custom x3.
lucpa
x1 (person(s)) is/are adopted by x2 (individual, family, tribe/clan, community, team, institution, etc.) into the latter's overarching family/clan/tribe/community/team/institution/etc. x4 in(to) role/relation x3 or an analog thereof via means/law/norm/socio-cultural or other mechanism x5; x2 adopts x1 into x2's family11.
cplancu
x1 (person(s)) is/are adopted by x2 (individual, family, tribe/clan, community, team, institution, etc.) into the latter's overarching family/clan/tribe/community/team/institution/etc. x4 in(to) role/relation x3 or an analog thereof via means/law/norm/socio-cultural or other mechanism x5; x2 adopts x1 into x2's family11.