Swiss-Italian Sign Language [swis1235] is similar to Italian Sign Language [ital1275] ( Penny Boyes Braem and Christian Rathmann 2010 ):22 and is in turn said to derive from French Sign Language ( Josep Quer and Laura Mazzoni and Galini Sapountzaki 2010: 98 , Serena Corazza 1993 ). Tunisian Sign Language [tuni1249] may be part of this family ( Kamei, Nobutaka 2004 ):47 but historical or lexical evidence to this effect is lacking in print. Aymen Nefaa (2023) contains a lexical comparison to LSF (but not to any other language) but the outcome in the low 30%:s range is inconclusive of a genealogical relationship to LSF, and if so, any closer relationship to, for example, Italian Sign.
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