Got my entire family on Signals (sisters, brothers, in-laws, parents, nephews…). We're very happy but could extend that to second degrees(?), to cousins and unc

Got my entire family on Signals (sisters, brothers, in-laws, parents, nephews…). We're very happy but could extend that to second degrees(?), to cousins and uncles. We're were close to succeed but we needed help (media, mostly).