The Commons is holding a debate about young people's mental health. The Lords are debating social mobility.
The government will lead a debate on the impact of the Brexit vote on the environment and climate change.
MEPs debate the EU's volunteer service, youth strategy and funding for farmers.
Health Minister Michelle O'Neill and Prof Rafael Bengoa discuss the future of health services in Northern Ireland with Stormont's Health Committee.
Plenary notes the 50th Anniversary of the Aberfan Disaster, before proceeding with finance questions. There are also debates on the UK Government's Wales Bill, local government and on a youth parliament.
Some big-name MPs on all sides are keen to get a place on the newly formed Brexit committee.