The Project Management Professional (PMP) emphasizes the importance of direct communication with project stakeholders to ensure clear and effective information exchange. When a stakeholder is not attending meetings and is seeking information through a family member on the team, it is essential for the project manager to engage directly with the stakeholder to establish proper communication channels. This aligns with the principles of stakeholder engagement and communication management, which are critical for project success. The project manager should request a meeting with the stakeholder to discuss project updates and expectations, and to integrate the stakeholder into the communication management plan.
: (Project Management Institute. (n.d.). A Guide to the Project Management Body of Knowledge (PMBOK Guide) - Sixth Edition and other PMI published standards; Project Management Institute. (n.d.). PMI's Professional in Business Analysis (PMI-PBA).)

When a project experiences schedule delays, especially with tasks on the critical path, it is crucial to review the critical path with stakeholders. This collaborative review helps in understanding the impact of the delays and in defining the next steps to mitigate the issues. The stakeholders, including the project team, suppliers, and sponsor, can provide valuable input and decision-making power to help navigate the issues1.
:
PMBOKGuide - Sixth Edition2.
"19 Frequently Asked Questions on the Critical Path Method" by Praveen Malik, PMP3.
"Exam PMP topic 1 question 321 discussion - ExamTopics"1.
"Five Tips for Being Prepared for Supply Chain Disruption" - PMI.org4.

A hybrid project is a project that combines predictive and adaptive approaches. In such a project, the project manager should ensure that the team receives continuous feedback from customers users to validate the alignment of the deliverables with the expectations. This is a key practice of agile and adaptive methods, which aim to maximize customer satisfaction and value delivery. Updating the project management plan, submitting a change request, or ensuring the team understands all additional project requirements are not steps that would prevent the misalignment of the deliverables with the expectations, but rather actions that could be taken after the problem has occurred. References: [PMI Agile Practice Guide], page 14; [PMBOKGuide 6th Edition], page 19.