Feeling Called to Respond to False Claims About Our Faith

As-salamu alaykum, dear brothers and sisters. Recently, I came across an article written by a local Christian missionary organization that contained many false accusations and misrepresentations about Islam. For context, I reverted to Islam about two years ago, and this particular organization is run by my aunt and uncle, whom I'm very close to. I have no issue with Christians practicing their faith-'To you your religion, and to me mine'-but as a Muslim, I feel I can't just stay silent when our deen is being publicly lied about. What really bothered me was that the author went on to spread lies about an amazing local Muslim charity that does incredible work here in South Africa and around the world. Alhamdulillah, we live peacefully here with strong bonds between different religious communities, even though South Africa isn't a Muslim-majority country. I'm not sure what the best approach is. I haven't had formal Islamic schooling, but I've learned enough to recognize when tafsir and aspects of aqeedah contradict the false claims being made. Should I write a response and ask an Aalim to review my references? Or should I talk to my aunt and uncle privately about how disrespectful their article is? Maybe it's better to publicly counter the misinformation to protect vulnerable Muslims from believing these lies, rather than getting involved in family matters? I'd appreciate your thoughts and duas.