and genitive plural ending ⟨-en⟩. The genitive plural with ⟨-ain⟩ is rare/archaic/dialectal. {{fi-decl-<span class="searchmatch">vanhempi</span>}} See <span class="searchmatch">Finnish</span> <span class="searchmatch">vanhempi</span>-type <span class="searchmatch">nominals</span>....
also: Appendix:<span class="searchmatch">Finnish</span> conjugation, Appendix:<span class="searchmatch">Finnish</span> <span class="searchmatch">nominal</span> forms, Wiktionary:<span class="searchmatch">Finnish</span> <span class="searchmatch">nominal</span> <span class="searchmatch">inflection</span>-table templates, and <span class="searchmatch">Finnish</span> noun cases This...