Hope this helps.There are free lectures on youtube for almost anything. Google statistics lectures you will find many.Google research lectures too. They are from the good schools like MIT for free.
Next I would suggest getting books on the following topics: statistics,research and research methodologies,logic and critical thinking,history and many data sets.As you have clearly noted,you want practical real life application.
I will explain.Statistics and research methods are tools that come with many issues but your brother needs the books.Logic and critical thinking will help to overcome issues involved in using those tools for example biases and hypothesis and learn analysis.It's a vital investment to learn critical thinking for life. History books will help improve analysis and test analysis skills because it gives practical examples from different times,people,places,conditions....the works.Next play around with data sets to practise the statistics skills on real world examples. Finally get talks and papers on the fields that discuss different angles and perspectives on the subject.With time and effort without a tutor your brother will have learnt a SUPERB! skill.Good luck
Uncertainty is certain.Let go