AWS::EC2::Host - InstanceFamily

## 2. Scope of request

c) new attribute for an existing resource is desired

Please support Instance Family for EC2 Dedicated Host. See https://docs.aws.amazon.com/cli/latest/reference/ec2/allocate-hosts.html

## 4. Suggest specific test cases

Provisions Dedicated Host with Instance Family set and not instance Size. Allowing a Dedicated host to mix and match sizes

## 6. Category (required) - Will help with tagging and be easier to find by other users to +1

Use the categories as displayed in the AWS Management Console (simplified):

1. Compute (EC2, ECS, EKS, Lambda...)

Start with the linked AWS CLI allocate-hosts documentation and review how this roadmap tracks CloudFormation resource coverage. The request is complete when AWS::EC2::Host supports an InstanceFamily attribute alongside the existing host settings, including a case that provisions a dedicated host with a family but no instance size and permits mixed sizes.

Written by the indexing model from the issue text.