Final answer:
Without complete information regarding Iris's family, we cannot ascertain if all members spoke ASL. Iris herself showed some level of communication ability, but the proficiency in ASL of her or her family cannot be determined from the limited details provided. Different educational and communication strategies might be used by families with deaf or hard-of-hearing members.
Step-by-step explanation:
The question about whether all members of Iris's family spoke ASL (American Sign Language) is incomplete and cannot be answered definitively with the information provided. However, this scenario provides an opportunity to explore communication methods, particularly in families where individuals may be deaf or hard of hearing. In such families, ASL can be a crucial mode of communication, although it is not always the case that every family member is proficient in sign language. Some members may rely on other forms of communication such as lip-reading, written notes, or gestures.
According to additional information provided, Iris learned to use signs, but it is unclear whether she learned formal ASL. The ability to understand and use basic language elements like "yes" and "no" points towards some level of communication skills, likely in a gestural or sign-supported form. Yet the extent of Iris's sign language abilities or the proficiency of her family members remains unknown without further context.
There is also the educational aspect to consider regarding language development in individuals who are deaf or hard of hearing. Educators and families may use a variety of approaches, including Bilingual-Bicultural (Bi-Bi), Total Communication, or Oralism, to teach language. In the Bi-Bi approach, for example, ASL is taught as a first language, and English as a second language, emphasizing the importance of proficiently learning sign language.