when relativizing obliques, an resumptive pronoun(which indicates a pronoun-retention strategy) may optionally be used, but it is more common to let the preposition for the relativized oblique to be stranded (and sometimes omitted) in the relative clause, like English and the Scandinavian languages.

however, when relativizing possessives, and sometimes, standard of comparisons, the resumptive pronoun is obligatory used.

The resumptive pronoun is identical to the 3rd person pronoun.

for example:

alen Kirino musume on mal alen Kyousuke seplar ik erogeimu fodo - Kirino is the girl with whom Kyousuke plays H-Games.(preposition stranding)

alen Kirino musume on mal alen Kyousuke seplar ik erogeimu fodo dala - Kirino is the girl with whom Kyousuke plays H-Games.(resumptive pronoun)

alen Kirino musume on mal alen Kyousuke seplar ik erogeimu - Kirino is the girl with whom Kyousuke plays H-Games.(simple gap)

alen Kirino musume on mal age imon dala ales rene Kyousuke - Kirino is the girl whose brother is called Kyousuke