mamta -mam- gismu

x1 is a mother of x2; x1 bears/mothers/acts maternally toward x2; [not necessarily biological].

See also patfu, sovda, rirni, rorci, tarbi, famti, bersa, jbena.

In notes:

bersa
x1 is a son of mother/father/parents x2 [not necessarily biological].
famti
x1 is an aunt/uncle of x2 by bond/tie x3; x1 is an associated member of x2's parent's generation.
jbena
x1 is born to x2 at time x3 [birthday] and place x4 [birthplace]; x1 is native to (fo) x4.
patfu
x1 is a father of x2; x1 begets/sires/acts paternal towards x2; [not necessarily biological].
rirni
x1 is a parent of/raises/rears x2; x1 mentors/acts parental toward child/protege x2.
rorci
x1 engenders/procreates/begets x2 with coparent x3.
sovda
x1 is an egg/ovum/sperm/pollen/gamete of/from organism [mother/father] x2.
tarbi
x1 is an embryo/zygote/fetus/fertilized egg with mother x2, and father x3.
pecai (comp!)
restrictive relative phrase marker: permanently / inalienably associated with; it is impossible or near-impossible to break that relation
mantymamta
mam1 is an ant queen of ants mam2=man1 of species/breed man2.
paznu
x1 is a non-binary offspring/child of parent(s) x2 [not necessarily biological]; x1 is filial (but not a son or daughter).
preri
x1 is a non-binary parent of x2 [not necessarily biological].
ki'inmoi
x1 is in relation x4 with x2 to the x3th degree; x1 is x3 nodes before x2 in the sequence such that every element thereof and the next element are linked by the relation x4; x1 is [ that which is in relation x4 with ] (repeat x3 times the part between brackets) x2
ko'orsi
x1 (ka, binary predicate) links x2 and x3, and x3 and x4, and x4 and x5, et cetera
mam
Mom/Mum