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In recent years, the old paradigm according to which only high-mass blackholes can launch powerful relativistic jets in active galactic nuclei (AGN) hasbegun to crumble. The discovery of $\gamma$-rays coming from narrow-lineSeyfert 1 galaxies (NLS1s), usually considered young and growing AGN harboringa central black hole with mass typically lower than 10$^8$ M$_\odot$, indicatedthat also these low-mass AGN can produce powerful relativistic jets. The searchfor parent population of $\gamma$-ray emitting NLS1s revealed their connectionwith compact steep-spectrum sources (CSS). In this proceeding we present areview of the current knowledge of these sources, we present the new importantcase of 3C 286, classified here for the fist time as NLS1, and we finallyprovide a tentative orientation based unification of NLS1s and CSS sources.

An orientation-based unification of young jetted AGN: the case of 3C 286