Claim that her sister is gay 

It is still just a claim and needs to be qualified. Three sources are given, the Daily Beast, The Atlantic and Mother Jones. Though it could be argued that they are not reliable sources, I think they are marginally reliable, there are three of them and each of these articles is written by professional journalist{s}. 

However, when I looking at the sources they do not definitively say Jennie is gay, which is contrary to the way the WP article now reads: The Atlantic says Jennie has been campaigning for her sister and may be a lesbian; Mother Jones says Jennie supports gay rights and lives with a girlfriend; Daily Beast says Wade Richards, a former employee of Christine's organization, SALT, says the O'Donnell has a sister who is gay. Daily Beast also says Christine campaigned against gay rights. Based on all of this, it is not established by RSs that Jennie is gay. So, I will be doing a combination of reverting and re-writing the earlier version of the statement.