Fathers Pass On Words While Mothers Pass On Sounds?

[R]esearchers, led by population geneticist Li Jin, found that in Indo-European populations, the paternal lineages (Y-chromosome) were correlated to the vocabulary (lexicon) of their languages, meanwhile the maternal lineages were associated with their pronunciations (phoneme).

From here. The paper is:

Menghari Zhang, et al., "Reconciling the father tongue and mother tongue hypotheses in Indo-European populations" National Science Review (2018) https://doi.org/10.1093/nsr/nwy083